If you want to really do an accumulative score, why not adjust the out of 5s into out of 10s? 4.5=9 & such...On GameStats they have it as a total of 9.3...they adjust the letter grades as well...A's being 9.5s (I guess A+ is 10)...though for Gaming Age's score of A they still made it 9.5 even though it says it's A/A (so idk if Gaming Age has an A+ score or not...)...